<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="../bootstrap-5.1.3-dist/css/bootstrap.css">
  <script src="../bootstrap-5.1.3-dist/js/bootstrap.js"></script>
</head>
<style>
  span {
    display: inline-block;
    width: 75px;
    height: 75px;
    margin: 6px;
    background-color: #f9f9f9;
  }
</style>
</head>

<body>
  <div class="container mt-3">
    <span class="border border-1"></span>
    <span class="border border-2"></span>
    <span class="border border-3"></span>
    <span class="border border-4"></span>
    <span class="border border-5"></span>
  </div>
</body>

</html>